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    <title>Zooming to a Set of Markers</title>
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        <h1>Zooming to a Set of Markers</h1>
        <p>Alter the viewport to ensure a group of objects are visible</p>
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    <p>This examples adds three markers showing the locations of 
      <b>Boston</b>, <b>Washington</b> and <b>Toronto</b> to the map and alters the map display to ensure that all of the markers are visible.</p>
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    <h3>Code</h3>
    <p>An <code>H.map.Group</code> is used to associate the markers together and the <code>group.getBounds()</code>
      method to find the minimal bounding box holding all of the group's contents. 
      The <code>map.viewBounds()</code> can then be updated.</p>
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